SOLUTION: How many gallons of a 35% saline solution must be mixed with 6 gallons of a 15% saline solution to make a 23% solution?

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Question 641817: How many gallons of a 35% saline solution must be mixed with 6 gallons of a 15% saline solution to make a 23% solution?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
How many gallons of a 35% saline solution must be mixed with 6 gallons of a 15% saline solution to make a 23% solution?
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Equation:
salt + salt = salt
0.35x + 0.15*6 = 0.23(x+6)
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35x + 15*6 = 23x + 23*6
12x = 8*6
x = (2/3)6
x = 4 gallons (amt. of 35% solution needed)
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Cheers,
Stan H.